A car body structure and rail vehicle

Abstract

The vehicle body structure disclosed in this application includes a roof, side walls, a chassis, and end walls. The top of the side walls is connected to the roof, and the bottom of the side walls is connected to the chassis. The end walls are located at both ends of the chassis extension direction and are connected to the roof and chassis, respectively. The roof, side walls, chassis, and end walls are all sandwich structures. Compared to existing vehicle body structures using plate-beam connections, the sandwich structure of this application significantly reduces the number of parts, thus reducing the weight of the vehicle body and achieving a lightweight design. It also reduces manual labor and improves the efficiency of automated production.

Description

Technical Field

[0001] This application relates to the field of rail transit vehicle technology, and more specifically, to a car body structure and a rail vehicle. Background Technology

[0002] With the rapid development of the rail transit industry, the performance requirements for rail vehicles are increasing, and lightweight design has become an urgent goal for the industry. Reducing the weight of rail vehicles can effectively reduce operating energy consumption, reduce track wear, and improve acceleration performance and passenger capacity, making it one of the key technological approaches to achieving green and efficient rail transit. Existing rail vehicle bodies typically adopt a plate-beam structure, resulting in a large number of components, complex structure, and heavy body mass.

[0003] Therefore, how to achieve lightweight design of vehicle body structure has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a vehicle body structure to achieve lightweight design.

[0005] Another key aspect of this application is to provide a rail vehicle that includes the aforementioned car body structure.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A vehicle body structure includes a roof, side walls, a chassis, and end walls. The top of the side walls is connected to the roof, the bottom of the side walls is connected to the chassis, and the end walls are disposed at both ends in the extending direction of the chassis and are respectively connected to the roof and the chassis.

[0008] The roof, side walls, chassis, and end walls are all sandwich structures, each including an inner wall panel, an outer wall panel, and a supporting sandwich layer disposed between the inner and outer wall panels.

[0009] Optionally, in the above-mentioned vehicle body structure, the roof includes an inner roof panel, an outer roof panel, a first supporting layer, a roof side beam, and an end curved beam. The inner roof panel and the outer roof panel are respectively disposed on opposite sides of the first supporting layer. The roof side beam is disposed on both sides of the first supporting layer extending along the width direction of the vehicle body and is connected to the outer roof panel. The inner roof panel, the outer roof panel, the first supporting layer, and the roof side beam form a first layer structure.

[0010] The end curved beams are located at both ends of the first sandwich structure along the length of the vehicle body, and the end walls are connected to the end curved beams.

[0011] Optionally, in the above-mentioned vehicle body structure, the roof side beam and the outer roof panel are either an integral structure or a separate structure.

[0012] Optionally, in the above-mentioned vehicle body structure, the side wall includes an inner side wall panel, a second supporting interlayer, an outer side wall panel, an upper side beam, a longitudinal beam, and a lower side beam. The inner side wall panel and the outer side wall panel are disposed on opposite sides of the second supporting interlayer. The upper side beam and the outer side wall panel are disposed on the same side and connected to each other. The inner side wall panel, the second supporting interlayer, the outer side wall panel, and the upper side beam form a second interlayer structure.

[0013] The longitudinal beams are respectively connected to the inner side wall panel and the outer side wall panel of the side wall;

[0014] The lower side beam is located at the bottom of the second sandwich structure to connect with the base frame.

[0015] Optionally, in the above-mentioned vehicle body structure, the roof side beam is bent outward to form a first bending section;

[0016] The top of the upper beam on the side wall is provided with a second outward bending section, which is connected to the first bending section to form an eaves.

[0017] Optionally, in the above-described vehicle body structure, the lower side beam includes a first lower side beam, a second lower side beam, and a third lower side beam. The first lower side beam, the second lower side beam, and the third lower side beam all extend along the length of the vehicle body. The first lower side beam is connected to the inner side wall panel and the outer side wall panel of the side wall, respectively. The third lower side beam is connected to the inner side wall panel of the side wall and the first lower side beam, respectively. The second lower side beam is connected to the first lower side beam and the third lower side beam, respectively. The underframe is connected to the third lower side beam.

[0018] Optionally, in the above-described vehicle body structure, the third lower side beam is provided with a boss for supporting the underframe.

[0019] Optionally, in the above-mentioned vehicle body structure, the underframe includes an upper floor, a third support mezzanine, a lower floor, a connecting beam, and an equipment mounting hoist. The upper floor and the lower floor are respectively disposed on opposite sides of the third support mezzanine. The connecting beam is disposed on the same side of the upper floor and connected to the upper floor. The upper floor, the third support mezzanine, the lower floor, and the connecting beam form a third mezzanine structure.

[0020] Both the connecting beam and the lower floor are connected to the second lower side beam;

[0021] The equipment is installed and suspended at the bottom of the third mezzanine structure.

[0022] Optionally, in the above-mentioned vehicle body structure, the end wall includes an inner wall panel, a fourth supporting interlayer, an outer wall panel, a connecting plate, a first end beam, a second end beam, and a third end beam. The inner wall panel and the outer wall panel are respectively disposed on opposite sides of the fourth supporting interlayer to form a fourth interlayer structure. The connecting plate is connected to the outer wall panel. The first end beam is disposed at the bottom of the third interlayer structure. The third end beam is connected to the inner wall panel and the first end beam, respectively. The second end beam is connected to the first end beam and the third end beam, respectively.

[0023] The base frame is connected to the third end beam.

[0024] Optionally, in the above-mentioned vehicle body structure, the bottom of the underframe is provided with a bolster beam and a traction beam, the traction beam extending along the length direction of the vehicle body, and the bolster beam extending along the width direction of the vehicle body.

[0025] A rail vehicle comprising the aforementioned car body structure.

[0026] As can be seen from the above scheme, the vehicle body structure disclosed in this application has a sandwich structure for the roof, side walls, chassis and end walls. Compared with the existing vehicle body structure which adopts a plate beam connection structure, it can reduce the weight of the vehicle body structure and realize the lightweight design of the vehicle body structure.

[0027] The rail vehicle disclosed in this application has the same technical effect as the car body structure, and will not be described in detail here. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the vehicle body structure disclosed in the embodiments of this application;

[0030] Figure 2 This is a cross-sectional view of the vehicle body structure disclosed in the embodiments of this application;

[0031] Figure 3 This is a schematic diagram of the roof structure disclosed in an embodiment of this application. Figure 1 ;

[0032] Figure 4 This is a schematic diagram of the roof structure disclosed in an embodiment of this application. Figure 2 ;

[0033] Figure 5 This is a schematic diagram of the sidewall structure disclosed in an embodiment of this application. Figure 1 ;

[0034] Figure 6 This is a schematic diagram of the sidewall structure disclosed in an embodiment of this application. Figure 2 ;

[0035] Figure 7 This is a schematic diagram of the base frame structure disclosed in the embodiments of this application;

[0036] Figure 8 This is a schematic diagram of the end wall structure disclosed in an embodiment of this application. Figure 1 ;

[0037] Figure 9 This is a schematic diagram of the end wall structure disclosed in an embodiment of this application. Figure 2 ;

[0038] Figure 10 This is a structural schematic diagram of the longitudinal beam wall disclosed in an embodiment of this application.

[0039] Among them, 100 is the roof, 110 is the inner roof panel, 120 is the outer roof panel, 130 is the first supporting mezzanine, 140 is the roof side beam, 141 is the first bending part, and 150 is the end bending beam.

[0040] 200 is the side wall, 210 is the inner side wall panel, 220 is the second supporting mezzanine, 230 is the outer side wall panel, 240 is the upper beam of the side wall, 241 is the second bend, 250 is the longitudinal beam, 260 is the lower beam, 261 is the first lower beam, 262 is the second lower beam, and 263 is the third lower beam.

[0041] 300 is the base frame, 310 is the upper floor, 320 is the third supporting mezzanine, 330 is the lower floor, 340 is the connecting beam, and 350 is the equipment installation hoist.

[0042] 400 is the end wall, 410 is the inner wall panel of the end wall, 420 is the fourth supporting mezzanine, 430 is the outer wall panel of the end wall, 440 is the connecting plate, 450 is the second end beam, 460 is the first end beam, and 470 is the third end beam.

[0043] 500 is the pillow beam. Detailed Implementation

[0044] The core of this application is to disclose a vehicle body structure to achieve lightweight design.

[0045] Another key aspect of this application is the disclosure of a rail vehicle that includes the aforementioned vehicle body structure.

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] like Figure 1 and Figure 2 As shown in the figure, this application discloses a vehicle body structure, including a roof 100, side walls 200, a chassis 300, and end walls 400. Two side walls 200 are included and extend along the length of the vehicle body. The top of the side walls 200 is connected to the roof 100, and the bottom of the side walls 200 is connected to the chassis 300. The end walls 400 are located at both ends of the extending direction of the chassis 300 and are respectively connected to the roof 100 and the chassis 300 to form an integral structure. The roof 100, side walls 200, chassis 300, and end walls 400 are all sandwich structures. Specifically, the sandwich structure includes an inner wall panel, an outer wall panel, and a supporting sandwich layer disposed between the inner and outer wall panels. The inner wall panel, outer wall panel, and supporting sandwich layer are preferably thin-walled stainless steel structures to reduce the weight of the vehicle body. The supporting sandwich layer is preferably a corrugated plate structure. The plane of the supporting sandwich layer is connected to the inner and outer wall panels respectively. This structure significantly reduces the amount of material used while ensuring the overall rigidity and strength of the vehicle body structure, thereby achieving a lightweight design of the vehicle body structure.

[0048] The vehicle body structure disclosed in this application has a sandwich structure for the roof 100, side walls 200, underframe 300 and end walls 400. Compared with the existing vehicle body structure which uses a plate beam connection structure, it can reduce the weight of the vehicle body structure and achieve a lightweight design of the vehicle body structure.

[0049] Furthermore, the roof 100, side wall 200, underframe 300, and end wall 400 are all welded components formed by laser welding and spot welding. Laser welding can achieve a smaller overlap width, save materials, and further realize the lightweight design of the vehicle body structure. By combining laser welding and spot welding, the amount of manual welding operations can be reduced, the automation rate of the vehicle body structure can be improved, and the production efficiency can be increased.

[0050] Furthermore, in some specific embodiments, such as Figure 3 and Figure 4As shown, the roof 100 includes an inner roof panel 110, an outer roof panel 120, a first supporting mezzanine 130, roof side beams 140, and end curved beams 150. The inner roof panel 110 and the outer roof panel 120 are respectively disposed on opposite sides of the first supporting mezzanine 130. The roof side beams 140 are disposed on both sides of the first supporting mezzanine 130 extending along the width of the vehicle body and are connected to the outer roof panel 120. The inner roof panel 110, the outer roof panel 120, the first supporting mezzanine 130, and the roof side beams 140 together form the first mezzanine structure. The end curved beams 150 are disposed at both ends of the first mezzanine structure extending along the length of the vehicle body, specifically as shown below. Figure 2 As shown, specifically, the end curved beam 150 is connected to the outer roof panel 120 and the inner roof panel 110 respectively, and the end wall 400 is connected to the end curved beam 150.

[0051] It should be noted that the first supporting interlayer 130 preferably has a corrugated plate structure. The first supporting interlayer 130 can be a continuous corrugated plate structure or composed of multiple spaced-apart corrugated plate structures. To further reduce the weight of the vehicle body structure, the inner roof panel 110 is provided with weight-reducing holes, specifically as follows... Figure 4 As shown. The roof side beam 140 and the end curved beam 150 are preferably integral structures. The integral structure has high strength and rigidity, which can improve the strength and rigidity of the vehicle body structure.

[0052] Preferably, the inner roof panel 110 is connected to the first supporting interlayer 130 by laser welding, the outer roof panel 120 and the roof side beam 140 are both connected to the first supporting interlayer 130 by spot welding, the roof side beam 140 is connected to the outer roof panel 120 by spot welding, and the end curved beam 150 is connected to the outer roof panel 120 and the inner roof panel 110 by spot welding. The vehicle body structure disclosed in this application has a simple roof structure with fewer types and numbers of parts, which can reduce the weight of the roof 100 and achieve a lightweight design of the vehicle body structure. The various components of the roof 100 are connected by laser welding and spot welding, which can reduce the amount of manual welding operations, improve the automation rate of the vehicle body structure, and increase manufacturing efficiency.

[0053] Furthermore, such as Figure 5 and Figure 6As shown in the figure, the side wall 200 includes an inner side wall panel 210, a second support sandwich layer 220, an outer side wall panel 230, an upper side beam 240 of the side wall, a longitudinal beam 250, and a lower side beam 260. Among them, the inner side wall panel 210 and the outer side wall panel 230 of the side wall are arranged on two opposite sides of the second support sandwich layer 220. The upper side beam 240 of the side wall and the outer side wall panel 230 of the side wall are arranged on the same side and are connected. The inner side wall panel 210, the second support sandwich layer 220, the outer side wall panel 230, and the upper side beam 240 of the side wall together form a second sandwich structure. The second support sandwich layer 220 is preferably a corrugated plate structure. The second support sandwich layer 220 can be a continuous corrugated plate structure or a corrugated plate structure arranged at intervals, which can be specifically determined according to the actual situation. The longitudinal beam 250 is respectively connected to the inner side wall panel 210 and the outer side wall panel 230 of the side wall. The longitudinal beam 250 extends along the length direction of the vehicle body and is preferably arranged at the top of the window and the door. Preferably, the structure of the longitudinal beam 250 is similar to a corrugated plate structure, and the specific structure is as Figure 10 shown. The lower side beam 260 is arranged at the bottom of the second sandwich structure to be connected to the underframe 300.

[0054] Furthermore, the roof side beam 140 is bent outward to form a first bending part 141. The top of the upper side beam 240 of the side wall is provided with a second bending part 241 that bends outward. The second bending part 241 is connected to the first bending part 141, preferably by spot welding, to form an eaves. The inner roof panel 110 and the inner side wall panel 210 of the side wall are connected by a connecting piece. Preferably, both the inner roof panel 110 and the inner side wall panel 210 of the side wall are connected to the connecting piece by arc welding.

[0055] Furthermore, as Figure 6 shown, the lower side beam 260 includes a first lower side beam 261, a second lower side beam 262, and a third lower side beam 263. The first lower side beam 261, the second lower side beam 262, and the third lower side beam 263 all extend along the length direction of the vehicle body. The first lower side beam 261 is respectively connected to the inner side wall panel 210 and the outer side wall panel 230 of the side wall. The third lower side beam 263 is respectively connected to the inner side wall panel 210 and the first lower side beam 261. The second lower side beam 262 is respectively connected to the first lower side beam 261 and the third lower side beam 263. That is, for the bottom of the side wall 200, from the outside of the vehicle to the inside of the vehicle, they are the outer side wall panel 230, the first lower side beam 261, the second lower side beam 262, and the third lower side beam 263 in sequence. The underframe 300 is connected to the third lower side beam 263. Preferably, the cross-section of the first lower side beam 261 is in an L-shaped structure, the cross-section of the second lower side beam 262 is in a rectangular shape, and the cross-section of the third lower side beam 263 is in a "U" - shaped structure to form a convex platform, and the convex platform is used to carry the underframe 300.

[0056] Furthermore, the inner wall panel 210 of the side wall is connected to the second supporting interlayer 220 by laser welding. The upper beam 240 and the outer wall panel 230 of the side wall are both connected to the second supporting interlayer 220 by spot welding. The upper beam 240 of the side wall is connected to the outer wall panel 230 of the side wall by spot welding. The longitudinal beam 250 is connected to the inner wall panel 210 of the side wall by laser welding. The longitudinal beam 250 is connected to the outer wall panel 230 of the side wall by spot welding. The first lower beam 261 is connected to the inner wall panel 210 of the side wall by laser welding and to the outer wall panel 230 of the side wall by spot welding. The third lower beam 263 is connected to the inner wall panel 210 and the first lower beam 261 of the side wall by laser welding. The second lower beam 262 is connected to the third lower beam 263 by laser welding and to the first lower beam 261 by spot welding. The side wall 200 is a welded component formed by laser welding and spot welding, which can reduce the amount of manual welding operations and improve manufacturing efficiency.

[0057] Furthermore, such as Figure 7 As shown, the base frame 300 includes an upper floor 310, a third support mezzanine 320, a lower floor 330, a connecting beam 340, and an equipment mounting hoist 350. The upper floor 310 and the lower floor 330 are respectively located on opposite sides of the third support mezzanine 320. The connecting beam 340 is located on the same side of the upper floor 310 and connected to it. The upper floor 310, the third support mezzanine 320, the lower floor 330, and the connecting beam 340 together form the third mezzanine structure. The third support mezzanine 320 is preferably a corrugated plate structure, which can be a continuous corrugated plate structure or an intermittent corrugated plate structure. Both the connecting beam 340 and the lower floor 330 are connected to the second lower side beam 262 to connect the base frame 300 to the side wall 200. The equipment installation hoist 350 is located at the bottom of the third mezzanine structure, that is, the equipment installation hoist 350 is connected to the lower floor 330. The equipment installation hoist 350 is used to support and install equipment, such as converters, battery boxes, air compressors, etc.

[0058] Specifically, the upper floor 310 is connected to the third support sandwich layer 320 by spot welding, the lower floor 330 is connected to the third support sandwich layer 320 by laser welding, the connecting beam 340 is connected to both the upper floor 310 and the third support sandwich layer 320 by spot welding, the connecting beam 340 and the lower floor 330 are both connected to the second lower side beam 262 by arc welding, and the equipment installation hanger 350 is connected to the lower floor 330 by laser welding. The lower floor 330 is connected to the third support sandwich layer 320 by laser welding, and the equipment installation hanger 350 is connected to the lower floor 330 by laser welding, which can improve the stiffness and fatigue strength of the joints between the lower floor 330 and the third support sandwich layer 320, and between the equipment installation hanger 350 and the lower floor 330, and achieve sealed connection; the other parts are connected by spot welding, which can reduce costs and at the same time reduce the porosity and spatter generated by laser welding.

[0059] Further, as Figures 8-9 shown, the end wall 400 includes an inner end wall wallboard 410, a fourth support sandwich layer 420, an outer end wall wallboard 430, a connecting plate 440, a first end beam 460, a second end beam 450 and a third end beam 470. The inner end wall wallboard 410 and the outer end wall wallboard 430 are respectively arranged on two opposite sides of the fourth support sandwich layer 420 to form a fourth sandwich structure. The fourth support sandwich layer 420 is preferably a corrugated plate structure, and the fourth support sandwich layer 420 can be a continuous corrugated plate structure or an intermittently arranged corrugated plate structure. The connecting plate 440 is used to connect the roof 100, the side wall 200 and the underframe 300. The connecting plate 440 is connected to the outer end wall wallboard 430. The first end beam 460 is arranged at the bottom of the third sandwich structure, that is, the first end beam 460 is respectively connected to the inner end wall wallboard 410 and the outer end wall wallboard 430. The third end beam 470 is respectively connected to the inner end wall wallboard 410 and the first end beam 460. The second end beam 450 is respectively connected to the first end beam 460 and the third end beam 470. That is, for the bottom of the end wall 400, from the outside of the vehicle to the inside of the vehicle, there are successively the connecting plate 440, the outer end wall wallboard 430, the first end beam 460, the second end beam 450 and the third end beam 470, and the underframe 300 is connected to the third end beam 470. Specifically, the upper floor 310 is connected to the inner end wall wallboard 410 by a connecting piece, and the lower floor 330 is connected to the third end beam 470; the inner end wall wallboard 410 is connected to the inner side wall wallboard 210 by a connecting piece, and the outer end wall wallboard 430 is connected to the outer side wall wallboard 230 through the connecting plate 440; the inner end wall wallboard 410 is connected to the inner roof top board 110 by a connecting piece, and the connecting plate 440 is connected to the outer roof top board 120, the roof side beam 140 and the end bending beam 150. Preferably, the cross section of the first end beam 460 is in an L-shaped structure, the cross section of the second end beam 450 is in a rectangular shape, and the cross section of the third end beam 470 is in a "Ji" character-shaped structure.

[0060] Specifically, the outer wall panel 430 of the end wall is connected to the fourth support interlayer 420 by spot welding, and the inner wall panel 410 of the end wall is connected to the fourth support interlayer 420 by laser welding; the connecting plate 440 is connected to the outer wall panel 430 of the end wall by spot welding, the first end beam 460 is connected to the inner wall panel 410 of the end wall by laser welding, the first end beam 460 is connected to the outer wall panel 430 of the end wall by spot welding, the third end beam 470 is connected to the inner wall panel 410 of the end wall and the first end beam 460 by laser welding, the second end beam 450 is connected to the third end beam 470 by laser welding, and the second end beam 450 is connected to the first end beam 460 by spot welding. The inner wall panel 410 of the end wall is connected to the fourth support interlayer 420 by laser welding, which can improve the rigidity and fatigue strength of the connection between the outer wall panel 430 of the end wall and the fourth support interlayer 420, and achieve a sealed connection; other parts are connected by spot welding, which can reduce costs and reduce the porosity and spatter caused by laser welding.

[0061] Furthermore, such as Figure 1 As shown in the embodiment of this application, the vehicle body structure has a bolster beam 500 and a traction beam at the bottom of the chassis 300. The traction beam extends along the length of the vehicle body, and the bolster beam 500 extends along the width of the vehicle body. Specifically, the traction beam is connected to the second end beam 450 of the end wall 400, and the bolster beam 500 is connected to the second lower side beam 262 of the side wall 200 and the lower floor 330 of the chassis 300, respectively.

[0062] The vehicle body structure disclosed in this application eliminates a series of scattered components such as the roof curved beam, the main cross beam of the chassis, the side wall columns and the outer panel reinforcement of the traditional structure, which greatly simplifies the vehicle body structure and enables the vehicle body structure to be lightweight and simplified. The roof 100, side wall 200, chassis 300 and end wall 400 all adopt a combination of laser welding and spot welding structure, which greatly reduces the amount of arc welding in the vehicle body structure and improves manufacturing efficiency.

[0063] In addition, this application also discloses a rail vehicle, which includes the vehicle body structure of the above embodiments. Therefore, it has the same technical effect as the vehicle body structure and will not be described again.

[0064] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0066] In the description of the embodiments of the application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0067] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0068] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A vehicle body structure, characterized in that, It includes a roof (100), side walls (200), a chassis (300) and end walls (400). The top of the side walls (200) is connected to the roof (100), the bottom of the side walls (200) is connected to the chassis (300), and the end walls (400) are located at both ends of the chassis (300) in the extension direction and are respectively connected to the roof (100) and the chassis (300). The roof (100), side wall (200), underframe (300) and end wall (400) are all sandwich structures.

2. The vehicle body structure as described in claim 1, characterized in that, The roof (100) includes an inner roof panel (110), an outer roof panel (120), a first support interlayer (130), a roof side beam (140), and an end curved beam (150). The inner roof panel (110) and the outer roof panel (120) are respectively disposed on opposite sides of the first support interlayer (130). The roof side beam (140) is disposed on both sides of the first support interlayer (130) extending along the width direction of the vehicle body and is connected to the outer roof panel (120). The inner roof panel (110), the outer roof panel (120), the first support interlayer (130), and the roof side beam (140) form a first interlayer structure. The end curved beams (150) are disposed at both ends of the first sandwich structure along the length of the vehicle body, and the end walls (400) are connected to the end curved beams (150).

3. The vehicle body structure as described in claim 2, characterized in that, The roof side beam (140) and the outer roof panel (120) are either an integral structure or a separate structure.

4. The vehicle body structure as described in claim 2, characterized in that, The side wall (200) includes an inner side wall panel (210), a second supporting mezzanine (220), an outer side wall panel (230), an upper side beam (240), a longitudinal beam (250), and a lower side beam (260). The inner side wall panel (210) and the outer side wall panel (230) are disposed on opposite sides of the second supporting mezzanine (220). The upper side beam (240) and the outer side wall panel (230) are disposed on the same side and connected to each other. The inner side wall panel (210), the second supporting mezzanine (220), the outer side wall panel (230), and the upper side beam (240) form a second mezzanine structure. The longitudinal beam (250) is connected to the inner side wall panel (210) and the outer side wall panel (230) of the side wall respectively; The lower side beam (260) is disposed at the bottom of the second sandwich structure to be connected to the base frame (300).

5. The vehicle body structure as described in claim 4, characterized in that, The roof side beam (140) bends outward to form the first bend (141). The top of the upper beam (240) on the side wall is provided with a second bending part (241) that bends outward. The second bending part (241) is connected to the first bending part (141) to form a rain eave.

6. The vehicle body structure as described in claim 4, characterized in that, The lower side beam (260) includes a first lower side beam (261), a second lower side beam (262), and a third lower side beam (263). The first lower side beam (261), the second lower side beam (262), and the third lower side beam (263) all extend along the length of the vehicle body. The first lower side beam (261) is connected to the inner side wall panel (210) and the outer side wall panel (230) of the side wall, respectively. The third lower side beam (263) is connected to the inner side wall panel (210) and the first lower side beam (261), respectively. The second lower side beam (262) is connected to the first lower side beam (261) and the third lower side beam (263), respectively. The underframe (300) is connected to the third lower side beam (263).

7. The vehicle body structure as described in claim 6, characterized in that, The third lower beam (263) is provided with a boss for supporting the base frame (300).

8. The vehicle body structure as described in claim 6, characterized in that, The base frame (300) includes an upper floor (310), a third support mezzanine (320), a lower floor (330), a connecting beam (340), and an equipment installation hoist (350). The upper floor (310) and the lower floor (330) are respectively disposed on opposite sides of the third support mezzanine (320). The connecting beam (340) is disposed on the same side of the upper floor (310) and connected to the upper floor (310). The upper floor (310), the third support mezzanine (320), the lower floor (330), and the connecting beam (340) form a third mezzanine structure. Both the connecting beam (340) and the lower floor (330) are connected to the second lower side beam (262); The equipment installation hoist (350) is located at the bottom of the third mezzanine structure.

9. The vehicle body structure as described in claim 8, characterized in that, The end wall (400) includes an inner wall panel (410), a fourth supporting mezzanine (420), an outer wall panel (430), a connecting plate (440), a first end beam (460), a second end beam (450), and a third end beam (470). The inner wall panel (410) and the outer wall panel (430) are respectively disposed on opposite sides of the fourth supporting mezzanine (420) to form a fourth mezzanine structure. The connecting plate (440) is connected to the outer wall panel (430). The first end beam (460) is disposed at the bottom of the third mezzanine structure. The third end beam (470) is connected to the inner wall panel (410) and the first end beam (460) respectively. The second end beam (450) is connected to the first end beam (460) and the third end beam (470) respectively. The base frame (300) is connected to the third end beam (470).

10. The vehicle body structure as described in claim 1, characterized in that, The bottom of the underframe (300) is provided with a bolster beam (500) and a traction beam, the traction beam extending along the length of the vehicle body and the bolster beam (500) extending along the width of the vehicle body.

11. A rail vehicle, characterized in that, Includes the vehicle body structure as described in any one of claims 1-10.

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